WO1987003996A1

WO1987003996A1 - Magnetic recording/regenerating apparatus

Info

Publication number: WO1987003996A1
Application number: PCT/JP1986/000638
Authority: WO
Inventors: Osamu Miyazawa; Nobuo Ishikawa; Mamoru Miyasaka; Kenichi Hirota
Original assignee: Seiko Epson Corporation
Priority date: 1985-12-25
Filing date: 1986-12-17
Publication date: 1987-07-02
Also published as: EP0252984A1; KR880701001A; US4864442A

Abstract

A magnetic recording/regenerating apparatus which employs a package in which a magnetic disk (1) provided with a media hub (2) composed of a magnetic material is held in a shell. The positioning of the media hub (2) in the axial direction is attained by bringing the media hub (2) into contact with an end of a spindle hub (17), and the positioning in the radial direction is attained by bringing the inner surface of a center core (4) formed together with the media hub (2) as a unitary structure into contact with the outer periphery of the spindle hub (17). Further, a drive pin (21) which couples the media hub (2) to the spindle hub (17) is provided on the inside of the inner surface of the center core (4) at the end of the media hub (2). Therefore, the spindle hub is formed in a small size, and good head contact is maintained.

Description

Recording and playback equipment *

The present invention relates to a magnetic recording / reproducing apparatus g having a media hub made of a magnetic material.

• 0 background technology 癍

As shown in FIG. 2, the conventional magnetic recording / reproducing apparatus disclosed in U.S. Pat. No. 4,445,157 has a spindle hub 14 and a spindle hub 14 of a motor 13 as shown in FIG. 7 is attached directly, and the disk hub 2 with the magnetic disk 1 planted inside the disk cartridge 3 is brought into contact with the magnetic attraction force, and the guide hole 6 2 is 4 is positioned as a guide for the magnetic disk in the radial direction. The drive bin 21 for driving the magnetic disk 1 is located outside the guide position S in the radial direction. Umenari was on the diameter side.

However, in the conventional magnetic recording / reproducing apparatus S, the motor spindle is used to guide the magnetic disk in the radial direction, so that the tip has a spherical surface to facilitate insertion. However, if the diameter of the motor spindle is increased in order to secure strength and positioning accuracy, it is necessary to secure a sufficient clearance for the motor, which hinders miniaturization. In addition, since the drive bin is formed in the outer diameter of the motor spindle, miniaturization of the media hub and the spindle hub has been difficult. Therefore, the magnetic disk is supported by a wide surface ridge,

25 Not only is it difficult to reach the volume, but also contact with magnetic heads (below head contact) ), Which seemed to act rigidly and did not fit well, making it difficult to obtain good magnetic recording / reproducing characteristics.

The * development solves such a problem, and its purpose is to provide a magnetic recording / reproducing apparatus that has reduced the size of the spin hap unit and the media hub unit and has enabled good head contact. Where you do it. Disclosure of the invention

That is, the present invention relates to a magnetic recording / reproducing apparatus using a magnetic disk having a media hub made of a magnetic material, wherein the position of the magnetic disk in the thickness direction is determined.

A spindle hub having an upper surface that is formed integrally with the media hub; and a center core having an inner surface portion formed integrally with the media hub and in contact with a side surface of the spindle hub to position the magnetic disk in a radial direction. The spindle hub is provided on the spindle hub, and is provided on the inner diameter side with respect to the inner surface of the center core, and a drive bin for quickly connecting the spindle hub and the media hub.

I S

Brief description of drawings 钥

FIG. 1 is a sectional view of an embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a sectional view of a conventional magnetic recording / reproducing apparatus.

FIG. 3 is a top view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 4 is a bottom view of the embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a perspective view showing a horizontal structure of a magnetic disk used in the magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is a sectional view showing an engagement state between a media hub and a spindle hub in the embodiment of the magnetic recording / reproducing apparatus of the present invention.

25 Fig. 7 is a plan view of Fig. 6. FIG. 8 is another cross-sectional view of the magnetic recording / reproducing apparatus of the invention (*). FIG. 9 is an explanatory view showing the operation of the magnetic recording / reproducing apparatus of the present invention. Perspective view of an example of a magnetic recording / reproducing device g

FIG. 11 is a cross-sectional view showing another embodiment of the magnetic recording / reproducing apparatus of the last generation, FIG. 13 is a bottom view showing rubber of a media hub portion of the magnetic recording / reproducing apparatus of the present invention,

FIG. 12 is a cross-sectional view of FIG.

FIG. 14 is a plan view of the upper gear lid in the embodiment of the magnetic recording / reproducing apparatus of the present invention,

FIG. 15 is a side view of FIG.

FIG. 16 is a plan view of a lower gimbal portion of the magnetic recording and reproducing apparatus according to the present invention;

FIG. 17 is a side view of FIG.

FIG. 18 and FIG. 19 are explanatory diagrams showing the effects of a magnetic recording / reproducing apparatus according to the present invention in a practical example.

FIG. 20 is a bottom view of another embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 21 is a cross-sectional view of another embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 22 is a cross-sectional view of another embodiment of the magnetic recording / reproducing apparatus of the present invention.

Fig. 23 is an explanatory diagram showing the magnetized state of the thrust magnet in Fig. 22, showing the best mode for carrying out the power generation.

FIG. 1 is a cross-sectional view of an embodiment of a magnetic recording / reproducing apparatus according to the present invention, and FIG. 9 is an explanatory view of the magnetic recording / reproducing apparatus. 1 Media hub made of a magnetic material for mounting with magnetic force of 8, 3 is a disk cartridge for storing magnetic disks 1 etc., 4 is a disk cartridge A center core for positioning the media happle in the radial direction with respect to the bin hub 17; 5a, an upper cleaning plate for pressing a liner for removing the surface of the magnetic disk 1; 5b is the upper cleaning plate and the lower cleaning plate in contact with the magnetic disk 1 such as 5a, and the lower cleaning plate is in contact with the plate positioning part 47. 11 is the disk cartridge. Holder, 12 is a pressurized contact that is attached to the presser spring 52 and presses the upper cleaning plate, 13 is a belt 16, motor pulley 15, and motor spindle 14. The spindle motor, which drives the spindle hub via the spindle 19, is mounted on the spindle hub and gives elastic force to push up the drive bin 21 movable in the direction of the spindle 25.

_{10 is a} drive pin spring, 20 is a spring retainer for fixing the ffi movement pin spring 19, 23 is a magnetic material integrally or separately fixed to the housing 2, and a thrust magnet mounted inside the spindle hub. A thrust yoke that pulls the spindle 22 downward in the figure, 26 is a bearing that freely supports the spindle 25 mated with the spindle hub 17 for rotation and movement in the 轴 direction, and 27 is a housing An adjustment screw that engages with 2 4 with a screw thread and adjusts the position of the spindle in the 轴 direction. 4 2 is a slide させる that slides the magnetic head.

Reference numeral 43 denotes a pressure spring for pressing the slide shaft 42, and reference numeral 44 denotes a spring fixing screw for fixing the pressure spring 43.

In such a configuration, when the adjusting screw 27 is turned, the adjusting screw 27 is moved up and down, and the spindle and the mated with the spindle hub 17 are connected to the thrust magnet 22.

It is pulled downward by 20 and moves up and down because it is in contact with adjusting screw 27.

Therefore, since the magnetic disk 1 is mounted on the spindle hub 17, for example, when the adjusting screw 27 is lowered, the magnetic disk 1 is also lowered.

Fig. 5 is a perspective view showing the structure of a magnetic disk used for the magnetic recording / reproducing apparatus of the present invention, 1 is a film-shaped magnetic disk with a magnetic material attached to the surface, 2

No. 25 uses magnetic force to mount magnetic disk 1 on the spindle hub of the magnetic recording / reproducing device. Media hub 4 made of a magnetic material, 4 is a center core, 5a is a cleaning plate that presses a liner 6a that removes dust from the surface of the magnetic disk 1, and sandwiches the magnetic disk. Similarly, a liner 5b and a cleaning plate 6b are formed below, and 7 is an erasure prevention switch for preventing erasure, and 8 is to protect the surface of the air disk 1. The shutter 9a is a guide hole for positioning the disk cartridge in the magnetic recording / reproducing apparatus, and another guide hole 9b is provided at a symmetric position. Reference numeral 10 denotes a positioning hole that destroys the magnetic disk 1 and the media hub 2 and generates a force that presses the center core against the spindle core. 3a is an upper disk cartridge, 3b is a lower disk cartridge, and a magnetic disk 1 or the like is inserted and integrated to form a disk cartridge.

By pressing the cleaning plates 5a and 5b while the magnetic disk 1 is rotating in such a * composition, the surface of the magnetic disk 1 is relieved and the surface is Sway is suppressed.

Fig. 13 is a bottom view illustrating the center part of the disc body in the embodiment of the present invention, where 1 is a magnetic disk, 2 is a magnetic disk 1 attached, and the magnetic force is applied. A media hub made of a magnetic material to be attracted to the spindle hub 17 indicated by a dashed line, and 4 is a center core constituting positioning surfaces 4 a and 4 b for guiding the side surfaces of the spindle hub 17. Numeral 57 denotes a positioning hole for positioning and driving the media hub 2, and is located approximately from the center 18a of the magnetic disk rotation with respect to the center line 58 of the positioning surfaces 4a and 4b. It has a straight portion 57a in the direction of 90 '. In addition, if the positioning hole 57 has the linear part 57a, the shape of other parts is arbitrary.

In such a configuration, when the magnetic disk 1 rotates, there is a load torque. Therefore, a driving force is applied to the linear portion 57a, and the reaction force F is used to position the linear portion 57a. W

4a and 4b are pressed against the spindle hub 17 and therefore the positioning surfaces 4a,

4 b of Chuneri a linear portion 5 7 a is 9 0 ^beta to become a point most efficient I rather pressing can Me-position S Decisive. In the figure, reference numeral 1 denotes an arrow indicating the rotating direction of the disk.

Fig. 12 is a cross-sectional view of Fig. 13 showing the magnetic disk 1 and media cartridge.

5 is attached with a thin layer 59 such as an adhesive or a double-sided adhesive tape, and the center core 4 is attached to the media hub 2 by artsert or adhesive. Is made of a magnetic material, is attracted to the spindle hub by magnetic force, and the attached surface of the magnetic disk 1 is a height reference surface 2a which comes into contact with the spindle hap.

FIG. 6 is a cross-sectional view showing a cross-sectional engagement state between a media hub and a spindle hub in an embodiment of the magnetic recording / reproducing apparatus g of the present invention, and FIG. 7 is a plan view.

2 1 is a drive bin that is movable up and down on the spindle hub and is positioned inside the media hub 2. The drive bin engages with the linear portion 5 7 of the hole 10 to drive the position, and 19 is the drive bin 21 upward. The drive bin spring pressurizes the drive bin spring, 20 is a spring retainer that fixes the drive bin spring 19 to the spindle hub 20, 2 a is the height reference surface that contacts the upper surface of the spindle hub, and 60 is the drive pin 2 1 and a relief part to prevent a change in abutment height due to fenders on the height reference plane 2 a due to the diligence of the media hub 2. 4 is a seter core and a positioning surface 4 a, Wedge-shaped engagement of spindle hub 17 with 4b determines lateral positioning. 6 1 has a magnetic disk

20 Cut part provided to facilitate engagement between spindle hub 17 and center core 4 when mounted. It should be noted that the size of the escape portion and the cut portion is not limited to the * actual example, but may be configured only in a certain portion.

In such a configuration, the drive bin 21 is pressed against the height reference plane 2a when the magnetic disk is mounted, as shown by the dashed line, and is elastically deformed by the drive bin spring.

It is stored inside the 25 spindle hub 17. New use ¾ Then, the user slides on the height reference surface 2a until the engagement with the positioning hole 21 is established, and when engaged, the dynamic bin rises due to elastic force and returns to the original position. Engagement is complete a

At this time, the length from the media hub to the tip of the drive bin projecting upward is small because the diameter is small, and the clearance is small. Therefore, the thickness can be easily reduced. In addition, the pushing force of the drive bin spring 19 needs to be 3 g or more due to the friction force with the spindle hub 17 and gravity, and if it is insufficient, a sufficient ascending speed cannot be obtained with respect to the sliding speed, and Before it is pressed again and cannot be engaged. The drive bin 21 must have a diameter of at least 0.4 mm in strength when driving a magnetic disk having a diameter of 2.:! To 2.9 inches, and a diameter of 2 mm or more. With a diameter of, it becomes meaningless as it becomes larger overall.

In addition, the spindle hub 17 is used as a reference for determining the height and one of the positions, and the larger the diameter is, the larger the contact area between the positioning surfaces 4a and 4b is. However, in order to secure sufficient storage capacity, the smaller the diameter, the better. Therefore, it is appropriate to set the diameter of the saddle hub 17 to 10.5 to 11.5 mm.

In addition, the magnetic attraction of the magnet 18 can be used to push down the drive bin as well as to fit the magnetic disk and lower the drive bin even when the height of the magnetic head 'or the cleaning plate and the spindle hub are different. g is required. On the other hand, the maximum value of the attraction force is restricted as follows when a magnetic disk having a diameter of 2.1 to 2.9 inches is used.

The slip torque 1 until the spindle hub 17 and the media hub 2 are positioned is RH, the frictional coefficient is μ «, and the magnet 1 is the equivalent contact radius of the spindle hub 17 and the media hub 2. Assuming that the suction force between 8 and media hub 2 is F Η,

A = RHXFHX ^ H, on the other hand, the slip torque due to the magnetic head B New paper And the liner are pressed against the magnetic disk by the cleaning plate, and the slip torque C is expressed by RD as the equivalent working radius of the magnetic disk and the magnetic head, and j D, the pressing force is FD, the equivalent contact radius of the magnetic disk and the liner under the cleaning plate is RP, the friction coefficient is ^ P, and the force applied to the pressure contact is FP. B = BDXFDX μD and C = RPXFPX-P. Here, A <B + C must be satisfied for the media hub and spindle hub to slide and the drive pin to slide. RH = 4 to 6 mm, H = 0.2 to 0.5, RD = 17 to 27 mm, FD = 7 to 30 g, ju, D = 0.3 to 0 · 8, RP = 20 to 30 mm, FP = 0, 5 to 10 g, μ, Ρ = 0.2 to 0.6 Therefore, considering these conditions, if the magnetic force is strong, Magnetic recording Since the magnetic properties are adversely affected, it is preferable that the attracting force of the magnet 18 be 300 g or less As described above, the magnetic disk is positioned on the upper surface and the side surface of the spindle hub, and the side guide portion is provided. By providing a driving pin on the inner diameter side, the guide on the side surface of the rear side can be reduced in size without being affected by the diameter of the spindle.

Fig. 14 is a plan view of one embodiment of the upper carriage body, Fig. 15 is a side view, 34a is the upper magnetic head, 35a is the head, core, 33 Is the upper carriage, 33a is the upper magnetic head 34a so that it can be elastically deformed as indicated by the dashed line.The upper gimbal part, 39 is for fixing the upper carriage 33. 40 is a suspension that elastically supports the upper carriage, 41 is a spring that applies a pressing force to the magnetic head, and 36a and 36b are deformed except for required parts The sabotter 36c for preventing the rotation is a pivot that supports the upper magnetic head 'at a point and prevents the upper and lower positions even though the rotation as shown by the dashed line is permitted.

In such a configuration, the suspension ₃ which is usually a separate body, the spring portion, and the gimbal portion are integrally formed. FIG. 16 is a plan view showing an embodiment of the lower magnetic head portion, FIG. 17 is a side view showing the lower magnetic head portion, 34 b is a lower magnetic head, and 35 b is a head core. Reference numeral 48 denotes a lower gimbal, reference numeral 48a denotes a rim, and the lower magnetic head can be displaced like a dashed line. FIGS. 18 and 19 are explanatory diagrams showing the effect of adjusting the height of the spindle hub in the implementation of the magnetic recording / reproducing apparatus of the invention. FIG. 18 is a diagram before adjustment of the spindle hub. Fig. 19 shows the state after adjustment. 1 is a magnetic disk, 2 is a media hub, 5a and 5b are cleaning plates, and 6a and 6b are the surfaces of the magnetic disk 1 which are pressed by the cleaning plates 5a and 5b. Liner for dust removal, 33a is the upper gimbal part, 63 is the fixed lower gimbal with immovable magnetic head, 34a is the upper magnetic head, and 34b is the lower magnetic head.

In such a configuration, the height of the cleaning hubs 5a and 5b, the media hub 2 attached to the spindle hub, and the lower magnetic head are fixed, and only the upper magnetic head is movable. If the heights are different, the surface created by the media hub 2, the surface created by the cleaning plates 5a and 5b, and the surface created by the lower magnetic head 34b are different from each other. The pressing force FP of the cleaning plates 5a and 5b and the pressing force FD of the magnetic head 'must be increased, and the magnetic disk must be bent to make contact. Nevertheless, the lower magnetic head 34b may be slightly displaced by a small amount g as shown in FIG. Was giving. Also, a large torque is required to drive the spindle motor in order to force the contact, or the surface of the magnetic disk 1 may be damaged, or a sharp inflection point 62 may occur to cause a contact with the media hub. In some cases, the attached condition was adversely affected. Therefore, high-precision fabrication was required, which hindered cost reduction.

Fig. 19 is an explanatory view when the position of the media hub 2 is lowered in Fig. 18, and the surface formed by the cleaning plates 5 a and 5 b and the media hub 2 are formed. The upper magnetic head 34a and the lower magnetic head 34b fit into the magnetic disk 1 and have a good head contact.

In addition, according to the invention of this time, since the media hub is miniaturized, the gap between the media hub and the magnetic head is long, and the magnetic disk acts seemingly soft, so that a more favorable head counter is achieved. A cut is obtained.

In the embodiment, the cleaning plates 5 a and 5 b are #: and the case where the lower gimbal 48 is movable is described, but the fixed lower gimbal 6 3 which does not move in place of the lower gimbal 48 is described. Even so, a good head contact can be obtained, and even if there is no cleaning plate 5a or 5b, the area of regulation is reduced, so a good head contact is obtained. Contact is obtained.

FIG. 3 shows: *: a top view of the embodiment of the magnetic recording / reproducing apparatus according to the invention, FIG. 4 is a bottom view, arrow r indicates the rotation direction of the magnetic disk 1, and arrow S indicates the lower gear lid 32 And the seek direction of the upper carriage 33, etc., 28 is a stepping motor 29 that seeks the rack 45 composed of the lower carriage 32 with the binion 30, and 29 is a stepping motor 2. 8 is the fixing screw, 42 is the slide shaft of the seek slide shaft, 43 is the slide 铀 holding spring, 44 is the slide 'shaft holding spring 43, the set screw of 43, and 37 is the upper cap The projection of the lower carriage 32 that suspends the spring of the carriage 33, 38 is a set screw that attaches the upper carriage to the lower carriage, and 46a and 46b are The spindle motor 13, the stepping motor 28, and the slide 42 are dismounted by the positioning pin fixed to the housing 24. Carts Li Tsu di

3 is located below the upper carriage 33 and the lower carriage 32 are connected to the side of the slide 轴 42, so that the size is extremely reduced.

FIG. 8 is another cross-sectional view of the embodiment of the magnetic recording / reproducing apparatus according to the present invention, which shows a stepping motor 28, a view 30, a rack 45, and a positioning pin 46a, 4 6b, upper magnetic head 34a, lower magnetic head 34b, upper carriage The relationship between di 33 and lower carriage 32 is shown. The positioning bins 46a and 6b are engaged with the guide holes 9a and 9b via the holder bin holes 51a and 51b, and are pressed by the contacts 11 and 11b to be positioned. Yes,

FIG. 10 is an exploded perspective view of an embodiment of the magnetic recording / reproducing apparatus of the present invention. The holder 11 includes a pressing spring portion 52 having a pressing contact 12 separately or integrally and a disk card. Place the trigger 3 on the positioning bins 46a, 46b, spacers 49a, 49b, and holder holding springs 53a, 53b on the housing 24. A disk cartridge 3 having a magnetic disk 1 or the like, which is a hole for fixing a magnetic disk, is inserted into the window portion 64 of the holder 11.

FIG. 11 is a sectional view showing another embodiment of the magnetic recording / reproducing apparatus of the present invention, in which a thrust spring 5 is mounted between a roller bearing 56 and a spindle hub 17. The spindle 25 engaged with the spindle hub 17 is raised, while a thread 58 is formed at the other end, and is positioned by the preload nut 55. Thrust spring 54: The shape of the spring is abrupt, and a part of it is formed as a cantilevered spring portion 54a to protrude to serve as a drive bin spring and to provide a rolling bearing. It also serves as a preload.

In such a configuration, it is possible to prevent the adverse effects of the magnetic field when the thrust magnet is used and the adverse effects on the rotational accuracy characteristics due to the addition of inertia.

20 Carriage 32 and the like are driven by lead screw 31. In such a configuration, lower carriage 32 and the like are hard to move against external force, It has the advantage of being difficult to offtrack.

FIG. 21 is a cross-sectional view of another embodiment of the magnetic recording / reproducing apparatus of the present invention. Attached. According to such a method, it is not necessary to form a screw portion in the housing 24, so that space can be saved.

FIG. 22 is a cross-sectional view of another embodiment of the magnetic recording / reproducing apparatus of * Kiyoshi, and FIG. 23 is an explanatory view of a thrust magnet part. Reference numeral 2 denotes a thrust magnet for attracting the thrust yoke 23 attached to the housing 24 to the thrust yoke 23 by magnetic attraction with the spindle hub 17 having the magnetic disk 1 attached thereto. 6 5 is a main magnetized pattern for generating magnetic attraction, and 6 6 is a main magnetized magnet for detecting the rotational speed of the spindle hub 17 containing the thrust magnet 22. The FG magnetization pattern 67 formed as a part of the pattern is a magnetic detector that detects the magnetic flux leaking from the FG magnetization pattern 66 to detect the rotation speed. In FIG. 23, the boundary between the magnetization of the N pole and the S pole is indicated by a broken line.

In such a configuration, since the FG magnetization pattern 66 is formed as a part of the main magnetization pattern 65, the magnetic attraction force has almost no influence on the magnetic attraction force, and the magnetic detection element 67 is used for scanning. Since the number of rotations of the pindle hap 17 can be detected and integrated, it is easy to reduce the size and cost.

Note that the magnetization pattern in the embodiment is an example, and the shape, shape, arrangement, number of divisions, and the like are not specified at all. The magnetic detector is also a Hall element, a magnetic resistance element, a coil, and the like. Various detection elements can be used.

The embodiments and the operation of the magnetic recording / reproducing apparatus of the present invention have been described above. However, the intention of the present invention is to make the spindle unit formed separately from the spindle motor movably in the 铀 direction. Therefore, the embodiment is not limited to the contents described in the present embodiment, and the application is not limited to the magnetic recording / reproducing apparatus.

As described above, according to the present invention, the positioning of the magnetic disk in the radial direction is performed on the side surface of the spindle hub, and the inner diameter side of the portion where the drive pin is positioned is positioned. The media section and spindle hub section can be made smaller, which not only achieves both high capacity and good head contact, but also the size of the magnetic recording / reproducing device S can be reduced. Is overwhelming.

o

I S

20

twenty five

Claims

Claims: In a magnetic recording / reproducing apparatus using a magnetic disk having a media hub made of a magnetic material, a spindle hub having an upper surface for determining a position of the magnetic disk in a thickness direction is provided. A center core integrally formed with the media hub and having an inner surface portion that abuts against a side surface of the spindle hub and determines a radial position of the magnetic disk; and a center core provided on the spindle hub. A magnetic recording / reproducing apparatus, comprising: the spindle hub and a drive bin for connecting the media hub on an inner diameter side of an inner surface of the center core.